src/inet/tests/TestInetCommonPosix.cpp - third_party/github/project-chip/connectedhomeip - Git at Google

 /*
  *
  *    Copyright (c) 2020-2021 Project CHIP Authors
  *    Copyright (c) 2013-2018 Nest Labs, Inc.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
  *    You may obtain a copy of the License at
  *
  *        http://www.apache.org/licenses/LICENSE-2.0
  *
  *    Unless required by applicable law or agreed to in writing, software
  *    distributed under the License is distributed on an "AS IS" BASIS,
  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *    See the License for the specific language governing permissions and
  *    limitations under the License.
  */

 /**
  *    @file
  *      This file implements constants, globals and interfaces common to
  *      and used by all CHP Inet layer library test applications and
  *      tools.
  *
  *      NOTE: These do not comprise a public part of the CHIP API and
  *            are subject to change without notice.
  *
  */

 #ifndef __STDC_LIMIT_MACROS
 #define __STDC_LIMIT_MACROS
 #endif
 #ifndef __STDC_FORMAT_MACROS
 #define __STDC_FORMAT_MACROS
 #endif

 #include "TestInetCommon.h"
 #include "TestInetCommonOptions.h"

 #include <assert.h>
 #include <errno.h>
 #include <vector>

 #include <inttypes.h>
 #include <stdint.h>
 #include <string.h>
 #include <sys/types.h>
 #include <unistd.h>

 #include <lib/support/CHIPMem.h>
 #include <lib/support/ErrorStr.h>
 #include <lib/support/ScopedBuffer.h>
 #include <platform/PlatformManager.h>
 #include <system/SystemClock.h>

 #if CHIP_SYSTEM_CONFIG_USE_LWIP
 #include <lwip/dns.h>
 #if (LWIP_VERSION_MAJOR == 2) && (LWIP_VERSION_MINOR == 0)
 #include <lwip/ip6_route_table.h>
 #endif // (LWIP_VERSION_MAJOR == 2) && (LWIP_VERSION_MINOR == 0)
 #include <lwip/init.h>
 #include <lwip/netif.h>
 #include <lwip/sys.h>
 #include <lwip/tcpip.h>
 #include <netif/etharp.h>

 #if CHIP_TARGET_STYLE_UNIX

 // TapAddrAutoconf and TapInterface are only needed for LwIP on
 // sockets simulation in which a host tap/tun interface is used to
 // proxy the LwIP stack onto a host native network interface.

 #include "TapAddrAutoconf.h"
 #include "TapInterface.h"
 #endif // CHIP_TARGET_STYLE_UNIX
 #endif // CHIP_SYSTEM_CONFIG_USE_LWIP

 using namespace chip;
 using namespace chip::Inet;

 System::LayerImpl gSystemLayer;

 Inet::UDPEndPointManagerImpl gUDP;
 Inet::TCPEndPointManagerImpl gTCP;

 #if CHIP_SYSTEM_CONFIG_USE_LWIP
 static sys_mbox_t * sLwIPEventQueue   = NULL;
 static unsigned int sLwIPAcquireCount = 0;

 static void AcquireLwIP(void)
 {
     if (sLwIPAcquireCount++ == 0)
     {
         sys_mbox_new(sLwIPEventQueue, 100);
     }
 }

 static void ReleaseLwIP(void)
 {
 #if (LWIP_VERSION_MAJOR == 2) && (LWIP_VERSION_MINOR == 0)
     if (sLwIPAcquireCount > 0 && --sLwIPAcquireCount == 0)
     {
 #if defined(INCLUDE_vTaskDelete) && INCLUDE_vTaskDelete
         // FreeRTOS need to delete the task not return from it.
         tcpip_finish(reinterpret_cast<tcpip_will_finish_fn>(vTaskDelete), NULL);
 #else  // defined(INCLUDE_vTaskDelete) && INCLUDE_vTaskDelete
         tcpip_finish(NULL, NULL);
 #endif // defined(INCLUDE_vTaskDelete) && INCLUDE_vTaskDelete
     }
 #endif // (LWIP_VERSION_MAJOR == 2) && (LWIP_VERSION_MINOR == 0)
 }

 #if CHIP_TARGET_STYLE_UNIX
 // TapAddrAutoconf and TapInterface are only needed for LwIP on
 // sockets simulation in which a host tap/tun interface is used to
 // proxy the LwIP stack onto a host native network interface.
 // CollectTapAddresses() is only available on such targets.
 static std::vector<TapInterface> sTapIFs;
 #endif // CHIP_TARGET_STYLE_UNIX

 static std::vector<struct netif> sNetIFs; // interface to filter

 static bool NetworkIsReady();
 static void OnLwIPInitComplete(void * arg);
 #endif // CHIP_SYSTEM_CONFIG_USE_LWIP

 char gDefaultTapDeviceName[32];
 bool gDone = false;

 void InetFailError(CHIP_ERROR err, const char * msg)
 {
     if (err != CHIP_NO_ERROR)
     {
         fprintf(stderr, "%s: %s\n", msg, ErrorStr(err));
         exit(-1);
     }
 }

 static void UseStdoutLineBuffering()
 {
     // Set stdout to be line buffered with a buffer of 512 (will flush on new line
     // or when the buffer of 512 is exceeded).
 #if CHIP_CONFIG_MEMORY_MGMT_MALLOC
     constexpr char * buf = nullptr;
 #else
     static char buf[512];
 #endif // CHIP_CONFIG_MEMORY_MGMT_MALLOC
     setvbuf(stdout, buf, _IOLBF, 512);
 }

 void InitTestInetCommon()
 {
     chip::Platform::MemoryInit();
     UseStdoutLineBuffering();
 }

 void ShutdownTestInetCommon()
 {
     chip::Platform::MemoryShutdown();
 }

 void InitSystemLayer()
 {
 #if CHIP_SYSTEM_CONFIG_USE_LWIP
     AcquireLwIP();
 #endif // !CHIP_SYSTEM_CONFIG_USE_LWIP

     gSystemLayer.Init();
 }

 void ShutdownSystemLayer()
 {
     gSystemLayer.Shutdown();

 #if CHIP_SYSTEM_CONFIG_USE_LWIP
     ReleaseLwIP();
 #endif // CHIP_SYSTEM_CONFIG_USE_LWIP
 }

 #if CHIP_SYSTEM_CONFIG_USE_LWIP
 static void PrintNetworkState()
 {
     char intfName[chip::Inet::InterfaceId::kMaxIfNameLength];

     for (size_t j = 0; j < gNetworkOptions.TapDeviceName.size(); j++)
     {
         struct netif * netIF = &(sNetIFs[j]);
 #if CHIP_TARGET_STYLE_UNIX
         // TapAddrAutoconf and TapInterface are only needed for LwIP on
         // sockets simulation in which a host tap/tun interface is used to
         // proxy the LwIP stack onto a host native network interface.
         // CollectTapAddresses() is only available on such targets.

         TapInterface * tapIF = &(sTapIFs[j]);
 #endif // CHIP_TARGET_STYLE_UNIX
         InterfaceId(netIF).GetInterfaceName(intfName, sizeof(intfName));

         printf("LwIP interface ready\n");
         printf("  Interface Name: %s\n", intfName);
         printf("  Tap Device: %s\n", gNetworkOptions.TapDeviceName[j]);
 #if CHIP_TARGET_STYLE_UNIX
         // TapAddrAutoconf and TapInterface are only needed for LwIP on
         // sockets simulation in which a host tap/tun interface is used to
         // proxy the LwIP stack onto a host native network interface.
         // CollectTapAddresses() is only available on such targets.

         printf("  MAC address: %02x:%02x:%02x:%02x:%02x:%02x\n", tapIF->macAddr[0], tapIF->macAddr[1], tapIF->macAddr[2],
                tapIF->macAddr[3], tapIF->macAddr[4], tapIF->macAddr[5]);
 #endif // CHIP_TARGET_STYLE_UNIX

 #if INET_CONFIG_ENABLE_IPV4
         printf("  IPv4 Address: %s\n", ipaddr_ntoa(&(netIF->ip_addr)));
         printf("  IPv4 Mask: %s\n", ipaddr_ntoa(&(netIF->netmask)));
         printf("  IPv4 Gateway: %s\n", ipaddr_ntoa(&(netIF->gw)));
 #endif // INET_CONFIG_ENABLE_IPV4
         for (int i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++)
         {
             if (!ip6_addr_isany(netif_ip6_addr(netIF, i)))
             {
                 printf("  IPv6 address: %s, 0x%02x\n", ip6addr_ntoa(netif_ip6_addr(netIF, i)), netif_ip6_addr_state(netIF, i));
             }
         }
     }
 }
 #endif // CHIP_SYSTEM_CONFIG_USE_LWIP

 void InitNetwork()
 {
 #if CHIP_SYSTEM_CONFIG_USE_LWIP

     // If an tap device name hasn't been specified, derive one from the IPv6 interface id.

     if (gNetworkOptions.TapDeviceName.empty())
     {
         for (size_t j = 0; j < gNetworkOptions.LocalIPv6Addr.size(); j++)
         {
             uint64_t iid    = gNetworkOptions.LocalIPv6Addr[j].InterfaceId();
             char * tap_name = (char *) chip::Platform::MemoryAlloc(sizeof(gDefaultTapDeviceName));
             assert(tap_name);
             snprintf(tap_name, sizeof(gDefaultTapDeviceName), "chip-dev-%x", static_cast<uint16_t>(iid));
             gNetworkOptions.TapDeviceName.push_back(tap_name);
         }
     }

 #if CHIP_TARGET_STYLE_UNIX
     // TapAddrAutoconf and TapInterface are only needed for LwIP on
     // sockets simulation in which a host tap/tun interface is used to
     // proxy the LwIP stack onto a host native network interface.
     // CollectTapAddresses() is only available on such targets.

     sTapIFs.clear();
 #endif // CHIP_TARGET_STYLE_UNIX
     sNetIFs.clear();

     for (size_t j = 0; j < gNetworkOptions.TapDeviceName.size(); j++)
     {
 #if CHIP_TARGET_STYLE_UNIX
         // TapAddrAutoconf and TapInterface are only needed for LwIP on
         // sockets simulation in which a host tap/tun interface is used to
         // proxy the LwIP stack onto a host native network interface.
         // CollectTapAddresses() is only available on such targets.

         TapInterface tapIF;
         sTapIFs.push_back(tapIF);
 #endif // CHIP_TARGET_STYLE_UNIX
         struct netif netIF;
         sNetIFs.push_back(netIF);
     }

 #if CHIP_TARGET_STYLE_UNIX

     // TapAddrAutoconf and TapInterface are only needed for LwIP on
     // sockets simulation in which a host tap/tun interface is used to
     // proxy the LwIP stack onto a host native network interface.
     // CollectTapAddresses() is only available on such targets.

     err_t lwipErr;

     for (size_t j = 0; j < gNetworkOptions.TapDeviceName.size(); j++)
     {
         lwipErr = TapInterface_Init(&(sTapIFs[j]), gNetworkOptions.TapDeviceName[j], NULL);
         if (lwipErr != ERR_OK)
         {
             printf("Failed to initialize tap device %s: %s\n", gNetworkOptions.TapDeviceName[j],
                    ErrorStr(System::MapErrorLwIP(lwipErr)));
             exit(EXIT_FAILURE);
         }
     }
 #endif // CHIP_TARGET_STYLE_UNIX
     tcpip_init(OnLwIPInitComplete, NULL);

     // Lock LwIP stack
     LOCK_TCPIP_CORE();

     for (size_t j = 0; j < gNetworkOptions.TapDeviceName.size(); j++)
     {
         std::vector<char *> addrsVec;

         addrsVec.clear();

 #if CHIP_TARGET_STYLE_UNIX

         // TapAddrAutoconf and TapInterface are only needed for LwIP on
         // sockets simulation in which a host tap/tun interface is used to
         // proxy the LwIP stack onto a host native network interface.
         // CollectTapAddresses() is only available on such targets.
         if (gNetworkOptions.TapUseSystemConfig)
         {
             CollectTapAddresses(addrsVec, gNetworkOptions.TapDeviceName[j]);
         }
 #endif // CHIP_TARGET_STYLE_UNIX
 #if INET_CONFIG_ENABLE_IPV4

         IPAddress ip4Addr = (j < gNetworkOptions.LocalIPv4Addr.size()) ? gNetworkOptions.LocalIPv4Addr[j] : IPAddress::Any;
         for (size_t n = 0; n < addrsVec.size(); n++)
         {
             IPAddress auto_addr;
             if (IPAddress::FromString(addrsVec[n], auto_addr) && auto_addr.IsIPv4())
             {
                 ip4Addr = auto_addr;
             }
         }

 #if CHIP_TARGET_STYLE_UNIX
         // TapAddrAutoconf and TapInterface are only needed for LwIP on
         // sockets simulation in which a host tap/tun interface is used to
         // proxy the LwIP stack onto a host native network interface.
         // CollectTapAddresses() is only available on such targets.

         IPAddress ip4Gateway = (j < gNetworkOptions.IPv4GatewayAddr.size()) ? gNetworkOptions.IPv4GatewayAddr[j] : IPAddress::Any;

         {
             ip4_addr_t ip4AddrLwIP, ip4NetmaskLwIP, ip4GatewayLwIP;

             ip4AddrLwIP = ip4Addr.ToIPv4();
             IP4_ADDR(&ip4NetmaskLwIP, 255, 255, 255, 0);
             ip4GatewayLwIP = ip4Gateway.ToIPv4();
             netif_add(&(sNetIFs[j]), &ip4AddrLwIP, &ip4NetmaskLwIP, &ip4GatewayLwIP, &(sTapIFs[j]), TapInterface_SetupNetif,
                       tcpip_input);
         }
 #endif // CHIP_TARGET_STYLE_UNIX

 #endif // INET_CONFIG_ENABLE_IPV4

         netif_create_ip6_linklocal_address(&(sNetIFs[j]), 1);

 #if (LWIP_VERSION_MAJOR == 2) && (LWIP_VERSION_MINOR == 0)
         if (j < gNetworkOptions.LocalIPv6Addr.size())
         {
             ip6_addr_t ip6addr = gNetworkOptions.LocalIPv6Addr[j].ToIPv6();
             s8_t index;
             netif_add_ip6_address_with_route(&(sNetIFs[j]), &ip6addr, 64, &index);
             // add ipv6 route for ipv6 address
             if (j < gNetworkOptions.IPv6GatewayAddr.size())
             {
                 static ip6_addr_t br_ip6_addr = gNetworkOptions.IPv6GatewayAddr[j].ToIPv6();
                 struct ip6_prefix ip6_prefix;
                 ip6_prefix.addr       = Inet::IPAddress::Any.ToIPv6();
                 ip6_prefix.prefix_len = 0;
                 ip6_add_route_entry(&ip6_prefix, &sNetIFs[j], &br_ip6_addr, NULL);
             }
             if (index >= 0)
             {
                 netif_ip6_addr_set_state(&(sNetIFs[j]), index, IP6_ADDR_PREFERRED);
             }
         }
         for (size_t n = 0; n < addrsVec.size(); n++)
         {
             IPAddress auto_addr;
             if (IPAddress::FromString(addrsVec[n], auto_addr) && !auto_addr.IsIPv4())
             {
                 ip6_addr_t ip6addr = auto_addr.ToIPv6();
                 s8_t index;
                 if (auto_addr.IsIPv6LinkLocal())
                     continue; // skip over the LLA addresses, LwIP is aready adding those
                 if (auto_addr.IsIPv6Multicast())
                     continue; // skip over the multicast addresses from host for now.
                 netif_add_ip6_address_with_route(&(sNetIFs[j]), &ip6addr, 64, &index);
                 if (index >= 0)
                 {
                     netif_ip6_addr_set_state(&(sNetIFs[j]), index, IP6_ADDR_PREFERRED);
                 }
             }
         }
 #endif // (LWIP_VERSION_MAJOR == 2) && (LWIP_VERSION_MINOR == 0)

         netif_set_up(&(sNetIFs[j]));
         netif_set_link_up(&(sNetIFs[j]));
     }

     netif_set_default(&(sNetIFs[0]));
     // UnLock LwIP stack

     UNLOCK_TCPIP_CORE();

     while (!NetworkIsReady())
     {
         constexpr uint32_t kSleepTimeMilliseconds = 100;
         ServiceEvents(kSleepTimeMilliseconds);
     }

     // FIXME: this is kinda nasty :(
     // Force new IP address to be ready, bypassing duplicate detection.

     for (size_t j = 0; j < gNetworkOptions.TapDeviceName.size(); j++)
     {
         if (j < gNetworkOptions.LocalIPv6Addr.size())
         {
             netif_ip6_addr_set_state(&(sNetIFs[j]), 2, 0x30);
         }
         else
         {
             netif_ip6_addr_set_state(&(sNetIFs[j]), 1, 0x30);
         }
     }

     PrintNetworkState();

     AcquireLwIP();

 #endif // CHIP_SYSTEM_CONFIG_USE_LWIP

     gTCP.Init(gSystemLayer);
     gUDP.Init(gSystemLayer);
 }

 void ServiceEvents(uint32_t aSleepTimeMilliseconds)
 {
     static bool printed = false;

     if (!printed)
     {
 #if CHIP_SYSTEM_CONFIG_USE_LWIP
         if (NetworkIsReady())
 #endif
         {
             printf("CHIP node ready to service events\n");
             fflush(stdout);
             printed = true;
         }
     }

     // Start a timer (with a no-op callback) to ensure that WaitForEvents() does not block longer than aSleepTimeMilliseconds.
     gSystemLayer.StartTimer(
         System::Clock::Milliseconds32(aSleepTimeMilliseconds), [](System::Layer *, void *) -> void {}, nullptr);

 #if CHIP_SYSTEM_CONFIG_USE_SOCKETS
     gSystemLayer.PrepareEvents();
     gSystemLayer.WaitForEvents();
     gSystemLayer.HandleEvents();
 #endif // CHIP_SYSTEM_CONFIG_USE_SOCKETS

 #if CHIP_SYSTEM_CONFIG_USE_LWIP
     if (gSystemLayer.IsInitialized())
     {
         static uint32_t sRemainingSystemLayerEventDelay = 0;

         if (sRemainingSystemLayerEventDelay == 0)
         {
             chip::DeviceLayer::PlatformMgr().RunEventLoop();
             sRemainingSystemLayerEventDelay = gNetworkOptions.EventDelay;
         }
         else
             sRemainingSystemLayerEventDelay--;

         gSystemLayer.HandlePlatformTimer();
     }
 #if CHIP_TARGET_STYLE_UNIX
     // TapAddrAutoconf and TapInterface are only needed for LwIP on
     // sockets simulation in which a host tap/tun interface is used to
     // proxy the LwIP stack onto a host native network interface.
     // CollectTapAddresses() is only available on such targets.

     TapInterface_Select(&(sTapIFs[0]), &(sNetIFs[0]), aSleepTime, gNetworkOptions.TapDeviceName.size());
 #endif // CHIP_TARGET_STYLE_UNIX
 #endif // CHIP_SYSTEM_CONFIG_USE_LWIP
 }

 #if CHIP_SYSTEM_CONFIG_USE_LWIP
 static bool NetworkIsReady()
 {
     bool ready = true;

     for (size_t j = 0; j < gNetworkOptions.TapDeviceName.size(); j++)
     {
         for (int i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++)
         {
             if (!ip6_addr_isany(netif_ip6_addr(&(sNetIFs[j]), i)) && ip6_addr_istentative(netif_ip6_addr_state(&(sNetIFs[j]), i)))
             {
                 ready = false;
                 break;
             }
         }
     }
     return ready;
 }

 static void OnLwIPInitComplete(void * arg)
 {
     printf("Waiting for addresses assignment...\n");
 }

 #endif // CHIP_SYSTEM_CONFIG_USE_LWIP

 void ShutdownNetwork()
 {
     gTCP.ForEachEndPoint([](TCPEndPoint * lEndPoint) -> Loop {
         gTCP.ReleaseEndPoint(lEndPoint);
         return Loop::Continue;
     });
     gTCP.Shutdown();

     gUDP.ForEachEndPoint([](UDPEndPoint * lEndPoint) -> Loop {
         gUDP.ReleaseEndPoint(lEndPoint);
         return Loop::Continue;
     });
     gUDP.Shutdown();
 #if CHIP_SYSTEM_CONFIG_USE_LWIP
     ReleaseLwIP();
 #endif
 }

 void DumpMemory(const uint8_t * mem, uint32_t len, const char * prefix, uint32_t rowWidth)
 {
     int indexWidth = snprintf(nullptr, 0, "%" PRIX32, len);

     if (indexWidth < 4)
         indexWidth = 4;

     for (uint32_t i = 0; i < len; i += rowWidth)
     {
         printf("%s%0*" PRIX32 ": ", prefix, indexWidth, i);

         uint32_t rowEnd = i + rowWidth;

         uint32_t j = i;
         for (; j < rowEnd && j < len; j++)
             printf("%02X ", mem[j]);

         for (; j < rowEnd; j++)
             printf("   ");

         for (j = i; j < rowEnd && j < len; j++)
             if (isprint(static_cast<char>(mem[j])))
                 printf("%c", mem[j]);
             else
                 printf(".");

         printf("\n");
     }
 }

 void DumpMemory(const uint8_t * mem, uint32_t len, const char * prefix)
 {
     const uint32_t kRowWidth = 16;

     DumpMemory(mem, len, prefix, kRowWidth);
 }
	/*
	*
	* Copyright (c) 2020-2021 Project CHIP Authors
	* Copyright (c) 2013-2018 Nest Labs, Inc.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	/**
	* @file
	* This file implements constants, globals and interfaces common to
	* and used by all CHP Inet layer library test applications and
	* tools.
	*
	* NOTE: These do not comprise a public part of the CHIP API and
	* are subject to change without notice.
	*
	*/

	#ifndef __STDC_LIMIT_MACROS
	#define __STDC_LIMIT_MACROS
	#endif
	#ifndef __STDC_FORMAT_MACROS
	#define __STDC_FORMAT_MACROS
	#endif

	#include "TestInetCommon.h"
	#include "TestInetCommonOptions.h"

	#include <assert.h>
	#include <errno.h>
	#include <vector>

	#include <inttypes.h>
	#include <stdint.h>
	#include <string.h>
	#include <sys/types.h>
	#include <unistd.h>

	#include <lib/support/CHIPMem.h>
	#include <lib/support/ErrorStr.h>
	#include <lib/support/ScopedBuffer.h>
	#include <platform/PlatformManager.h>
	#include <system/SystemClock.h>

	#if CHIP_SYSTEM_CONFIG_USE_LWIP
	#include <lwip/dns.h>
	#if (LWIP_VERSION_MAJOR == 2) && (LWIP_VERSION_MINOR == 0)
	#include <lwip/ip6_route_table.h>
	#endif // (LWIP_VERSION_MAJOR == 2) && (LWIP_VERSION_MINOR == 0)
	#include <lwip/init.h>
	#include <lwip/netif.h>
	#include <lwip/sys.h>
	#include <lwip/tcpip.h>
	#include <netif/etharp.h>

	#if CHIP_TARGET_STYLE_UNIX

	// TapAddrAutoconf and TapInterface are only needed for LwIP on
	// sockets simulation in which a host tap/tun interface is used to
	// proxy the LwIP stack onto a host native network interface.

	#include "TapAddrAutoconf.h"
	#include "TapInterface.h"
	#endif // CHIP_TARGET_STYLE_UNIX
	#endif // CHIP_SYSTEM_CONFIG_USE_LWIP

	using namespace chip;
	using namespace chip::Inet;

	System::LayerImpl gSystemLayer;

	Inet::UDPEndPointManagerImpl gUDP;
	Inet::TCPEndPointManagerImpl gTCP;

	#if CHIP_SYSTEM_CONFIG_USE_LWIP
	static sys_mbox_t * sLwIPEventQueue = NULL;
	static unsigned int sLwIPAcquireCount = 0;

	static void AcquireLwIP(void)
	{
	if (sLwIPAcquireCount++ == 0)
	{
	sys_mbox_new(sLwIPEventQueue, 100);
	}
	}

	static void ReleaseLwIP(void)
	{
	#if (LWIP_VERSION_MAJOR == 2) && (LWIP_VERSION_MINOR == 0)
	if (sLwIPAcquireCount > 0 && --sLwIPAcquireCount == 0)
	{
	#if defined(INCLUDE_vTaskDelete) && INCLUDE_vTaskDelete
	// FreeRTOS need to delete the task not return from it.
	tcpip_finish(reinterpret_cast<tcpip_will_finish_fn>(vTaskDelete), NULL);
	#else // defined(INCLUDE_vTaskDelete) && INCLUDE_vTaskDelete
	tcpip_finish(NULL, NULL);
	#endif // defined(INCLUDE_vTaskDelete) && INCLUDE_vTaskDelete
	}
	#endif // (LWIP_VERSION_MAJOR == 2) && (LWIP_VERSION_MINOR == 0)
	}

	#if CHIP_TARGET_STYLE_UNIX
	// TapAddrAutoconf and TapInterface are only needed for LwIP on
	// sockets simulation in which a host tap/tun interface is used to
	// proxy the LwIP stack onto a host native network interface.
	// CollectTapAddresses() is only available on such targets.
	static std::vector<TapInterface> sTapIFs;
	#endif // CHIP_TARGET_STYLE_UNIX

	static std::vector<struct netif> sNetIFs; // interface to filter

	static bool NetworkIsReady();
	static void OnLwIPInitComplete(void * arg);
	#endif // CHIP_SYSTEM_CONFIG_USE_LWIP

	char gDefaultTapDeviceName[32];
	bool gDone = false;

	void InetFailError(CHIP_ERROR err, const char * msg)
	{
	if (err != CHIP_NO_ERROR)
	{
	fprintf(stderr, "%s: %s\n", msg, ErrorStr(err));
	exit(-1);
	}
	}

	static void UseStdoutLineBuffering()
	{
	// Set stdout to be line buffered with a buffer of 512 (will flush on new line
	// or when the buffer of 512 is exceeded).
	#if CHIP_CONFIG_MEMORY_MGMT_MALLOC
	constexpr char * buf = nullptr;
	#else
	static char buf[512];
	#endif // CHIP_CONFIG_MEMORY_MGMT_MALLOC
	setvbuf(stdout, buf, _IOLBF, 512);
	}

	void InitTestInetCommon()
	{
	chip::Platform::MemoryInit();
	UseStdoutLineBuffering();
	}

	void ShutdownTestInetCommon()
	{
	chip::Platform::MemoryShutdown();
	}

	void InitSystemLayer()
	{
	#if CHIP_SYSTEM_CONFIG_USE_LWIP
	AcquireLwIP();
	#endif // !CHIP_SYSTEM_CONFIG_USE_LWIP

	gSystemLayer.Init();
	}

	void ShutdownSystemLayer()
	{
	gSystemLayer.Shutdown();

	#if CHIP_SYSTEM_CONFIG_USE_LWIP
	ReleaseLwIP();
	#endif // CHIP_SYSTEM_CONFIG_USE_LWIP
	}

	#if CHIP_SYSTEM_CONFIG_USE_LWIP
	static void PrintNetworkState()
	{
	char intfName[chip::Inet::InterfaceId::kMaxIfNameLength];

	for (size_t j = 0; j < gNetworkOptions.TapDeviceName.size(); j++)
	{
	struct netif * netIF = &(sNetIFs[j]);
	#if CHIP_TARGET_STYLE_UNIX
	// TapAddrAutoconf and TapInterface are only needed for LwIP on
	// sockets simulation in which a host tap/tun interface is used to
	// proxy the LwIP stack onto a host native network interface.
	// CollectTapAddresses() is only available on such targets.

	TapInterface * tapIF = &(sTapIFs[j]);
	#endif // CHIP_TARGET_STYLE_UNIX
	InterfaceId(netIF).GetInterfaceName(intfName, sizeof(intfName));

	printf("LwIP interface ready\n");
	printf(" Interface Name: %s\n", intfName);
	printf(" Tap Device: %s\n", gNetworkOptions.TapDeviceName[j]);
	#if CHIP_TARGET_STYLE_UNIX
	// TapAddrAutoconf and TapInterface are only needed for LwIP on
	// sockets simulation in which a host tap/tun interface is used to
	// proxy the LwIP stack onto a host native network interface.
	// CollectTapAddresses() is only available on such targets.

	printf(" MAC address: %02x:%02x:%02x:%02x:%02x:%02x\n", tapIF->macAddr[0], tapIF->macAddr[1], tapIF->macAddr[2],
	tapIF->macAddr[3], tapIF->macAddr[4], tapIF->macAddr[5]);
	#endif // CHIP_TARGET_STYLE_UNIX

	#if INET_CONFIG_ENABLE_IPV4
	printf(" IPv4 Address: %s\n", ipaddr_ntoa(&(netIF->ip_addr)));
	printf(" IPv4 Mask: %s\n", ipaddr_ntoa(&(netIF->netmask)));
	printf(" IPv4 Gateway: %s\n", ipaddr_ntoa(&(netIF->gw)));
	#endif // INET_CONFIG_ENABLE_IPV4
	for (int i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++)
	{
	if (!ip6_addr_isany(netif_ip6_addr(netIF, i)))
	{
	printf(" IPv6 address: %s, 0x%02x\n", ip6addr_ntoa(netif_ip6_addr(netIF, i)), netif_ip6_addr_state(netIF, i));
	}
	}
	}
	}
	#endif // CHIP_SYSTEM_CONFIG_USE_LWIP

	void InitNetwork()
	{
	#if CHIP_SYSTEM_CONFIG_USE_LWIP

	// If an tap device name hasn't been specified, derive one from the IPv6 interface id.

	if (gNetworkOptions.TapDeviceName.empty())
	{
	for (size_t j = 0; j < gNetworkOptions.LocalIPv6Addr.size(); j++)
	{
	uint64_t iid = gNetworkOptions.LocalIPv6Addr[j].InterfaceId();
	char * tap_name = (char *) chip::Platform::MemoryAlloc(sizeof(gDefaultTapDeviceName));
	assert(tap_name);
	snprintf(tap_name, sizeof(gDefaultTapDeviceName), "chip-dev-%x", static_cast<uint16_t>(iid));
	gNetworkOptions.TapDeviceName.push_back(tap_name);
	}
	}

	#if CHIP_TARGET_STYLE_UNIX
	// TapAddrAutoconf and TapInterface are only needed for LwIP on
	// sockets simulation in which a host tap/tun interface is used to
	// proxy the LwIP stack onto a host native network interface.
	// CollectTapAddresses() is only available on such targets.

	sTapIFs.clear();
	#endif // CHIP_TARGET_STYLE_UNIX
	sNetIFs.clear();

	for (size_t j = 0; j < gNetworkOptions.TapDeviceName.size(); j++)
	{
	#if CHIP_TARGET_STYLE_UNIX
	// TapAddrAutoconf and TapInterface are only needed for LwIP on
	// sockets simulation in which a host tap/tun interface is used to
	// proxy the LwIP stack onto a host native network interface.
	// CollectTapAddresses() is only available on such targets.

	TapInterface tapIF;
	sTapIFs.push_back(tapIF);
	#endif // CHIP_TARGET_STYLE_UNIX
	struct netif netIF;
	sNetIFs.push_back(netIF);
	}

	#if CHIP_TARGET_STYLE_UNIX

	// TapAddrAutoconf and TapInterface are only needed for LwIP on
	// sockets simulation in which a host tap/tun interface is used to
	// proxy the LwIP stack onto a host native network interface.
	// CollectTapAddresses() is only available on such targets.

	err_t lwipErr;

	for (size_t j = 0; j < gNetworkOptions.TapDeviceName.size(); j++)
	{
	lwipErr = TapInterface_Init(&(sTapIFs[j]), gNetworkOptions.TapDeviceName[j], NULL);
	if (lwipErr != ERR_OK)
	{
	printf("Failed to initialize tap device %s: %s\n", gNetworkOptions.TapDeviceName[j],
	ErrorStr(System::MapErrorLwIP(lwipErr)));
	exit(EXIT_FAILURE);
	}
	}
	#endif // CHIP_TARGET_STYLE_UNIX
	tcpip_init(OnLwIPInitComplete, NULL);

	// Lock LwIP stack
	LOCK_TCPIP_CORE();

	for (size_t j = 0; j < gNetworkOptions.TapDeviceName.size(); j++)
	{
	std::vector<char *> addrsVec;

	addrsVec.clear();

	#if CHIP_TARGET_STYLE_UNIX

	// TapAddrAutoconf and TapInterface are only needed for LwIP on
	// sockets simulation in which a host tap/tun interface is used to
	// proxy the LwIP stack onto a host native network interface.
	// CollectTapAddresses() is only available on such targets.
	if (gNetworkOptions.TapUseSystemConfig)
	{
	CollectTapAddresses(addrsVec, gNetworkOptions.TapDeviceName[j]);
	}
	#endif // CHIP_TARGET_STYLE_UNIX
	#if INET_CONFIG_ENABLE_IPV4

	IPAddress ip4Addr = (j < gNetworkOptions.LocalIPv4Addr.size()) ? gNetworkOptions.LocalIPv4Addr[j] : IPAddress::Any;
	for (size_t n = 0; n < addrsVec.size(); n++)
	{
	IPAddress auto_addr;
	if (IPAddress::FromString(addrsVec[n], auto_addr) && auto_addr.IsIPv4())
	{
	ip4Addr = auto_addr;
	}
	}

	#if CHIP_TARGET_STYLE_UNIX
	// TapAddrAutoconf and TapInterface are only needed for LwIP on
	// sockets simulation in which a host tap/tun interface is used to
	// proxy the LwIP stack onto a host native network interface.
	// CollectTapAddresses() is only available on such targets.

	IPAddress ip4Gateway = (j < gNetworkOptions.IPv4GatewayAddr.size()) ? gNetworkOptions.IPv4GatewayAddr[j] : IPAddress::Any;

	{
	ip4_addr_t ip4AddrLwIP, ip4NetmaskLwIP, ip4GatewayLwIP;

	ip4AddrLwIP = ip4Addr.ToIPv4();
	IP4_ADDR(&ip4NetmaskLwIP, 255, 255, 255, 0);
	ip4GatewayLwIP = ip4Gateway.ToIPv4();
	netif_add(&(sNetIFs[j]), &ip4AddrLwIP, &ip4NetmaskLwIP, &ip4GatewayLwIP, &(sTapIFs[j]), TapInterface_SetupNetif,
	tcpip_input);
	}
	#endif // CHIP_TARGET_STYLE_UNIX

	#endif // INET_CONFIG_ENABLE_IPV4

	netif_create_ip6_linklocal_address(&(sNetIFs[j]), 1);

	#if (LWIP_VERSION_MAJOR == 2) && (LWIP_VERSION_MINOR == 0)
	if (j < gNetworkOptions.LocalIPv6Addr.size())
	{
	ip6_addr_t ip6addr = gNetworkOptions.LocalIPv6Addr[j].ToIPv6();
	s8_t index;
	netif_add_ip6_address_with_route(&(sNetIFs[j]), &ip6addr, 64, &index);
	// add ipv6 route for ipv6 address
	if (j < gNetworkOptions.IPv6GatewayAddr.size())
	{
	static ip6_addr_t br_ip6_addr = gNetworkOptions.IPv6GatewayAddr[j].ToIPv6();
	struct ip6_prefix ip6_prefix;
	ip6_prefix.addr = Inet::IPAddress::Any.ToIPv6();
	ip6_prefix.prefix_len = 0;
	ip6_add_route_entry(&ip6_prefix, &sNetIFs[j], &br_ip6_addr, NULL);
	}
	if (index >= 0)
	{
	netif_ip6_addr_set_state(&(sNetIFs[j]), index, IP6_ADDR_PREFERRED);
	}
	}
	for (size_t n = 0; n < addrsVec.size(); n++)
	{
	IPAddress auto_addr;
	if (IPAddress::FromString(addrsVec[n], auto_addr) && !auto_addr.IsIPv4())
	{
	ip6_addr_t ip6addr = auto_addr.ToIPv6();
	s8_t index;
	if (auto_addr.IsIPv6LinkLocal())
	continue; // skip over the LLA addresses, LwIP is aready adding those
	if (auto_addr.IsIPv6Multicast())
	continue; // skip over the multicast addresses from host for now.
	netif_add_ip6_address_with_route(&(sNetIFs[j]), &ip6addr, 64, &index);
	if (index >= 0)
	{
	netif_ip6_addr_set_state(&(sNetIFs[j]), index, IP6_ADDR_PREFERRED);
	}
	}
	}
	#endif // (LWIP_VERSION_MAJOR == 2) && (LWIP_VERSION_MINOR == 0)

	netif_set_up(&(sNetIFs[j]));
	netif_set_link_up(&(sNetIFs[j]));
	}

	netif_set_default(&(sNetIFs[0]));
	// UnLock LwIP stack

	UNLOCK_TCPIP_CORE();

	while (!NetworkIsReady())
	{
	constexpr uint32_t kSleepTimeMilliseconds = 100;
	ServiceEvents(kSleepTimeMilliseconds);
	}

	// FIXME: this is kinda nasty :(
	// Force new IP address to be ready, bypassing duplicate detection.

	for (size_t j = 0; j < gNetworkOptions.TapDeviceName.size(); j++)
	{
	if (j < gNetworkOptions.LocalIPv6Addr.size())
	{
	netif_ip6_addr_set_state(&(sNetIFs[j]), 2, 0x30);
	}
	else
	{
	netif_ip6_addr_set_state(&(sNetIFs[j]), 1, 0x30);
	}
	}

	PrintNetworkState();

	AcquireLwIP();

	#endif // CHIP_SYSTEM_CONFIG_USE_LWIP

	gTCP.Init(gSystemLayer);
	gUDP.Init(gSystemLayer);
	}

	void ServiceEvents(uint32_t aSleepTimeMilliseconds)
	{
	static bool printed = false;

	if (!printed)
	{
	#if CHIP_SYSTEM_CONFIG_USE_LWIP
	if (NetworkIsReady())
	#endif
	{
	printf("CHIP node ready to service events\n");
	fflush(stdout);
	printed = true;
	}
	}

	// Start a timer (with a no-op callback) to ensure that WaitForEvents() does not block longer than aSleepTimeMilliseconds.
	gSystemLayer.StartTimer(
	System::Clock::Milliseconds32(aSleepTimeMilliseconds), [](System::Layer , void ) -> void {}, nullptr);

	#if CHIP_SYSTEM_CONFIG_USE_SOCKETS
	gSystemLayer.PrepareEvents();
	gSystemLayer.WaitForEvents();
	gSystemLayer.HandleEvents();
	#endif // CHIP_SYSTEM_CONFIG_USE_SOCKETS

	#if CHIP_SYSTEM_CONFIG_USE_LWIP
	if (gSystemLayer.IsInitialized())
	{
	static uint32_t sRemainingSystemLayerEventDelay = 0;

	if (sRemainingSystemLayerEventDelay == 0)
	{
	chip::DeviceLayer::PlatformMgr().RunEventLoop();
	sRemainingSystemLayerEventDelay = gNetworkOptions.EventDelay;
	}
	else
	sRemainingSystemLayerEventDelay--;

	gSystemLayer.HandlePlatformTimer();
	}
	#if CHIP_TARGET_STYLE_UNIX
	// TapAddrAutoconf and TapInterface are only needed for LwIP on
	// sockets simulation in which a host tap/tun interface is used to
	// proxy the LwIP stack onto a host native network interface.
	// CollectTapAddresses() is only available on such targets.

	TapInterface_Select(&(sTapIFs[0]), &(sNetIFs[0]), aSleepTime, gNetworkOptions.TapDeviceName.size());
	#endif // CHIP_TARGET_STYLE_UNIX
	#endif // CHIP_SYSTEM_CONFIG_USE_LWIP
	}

	#if CHIP_SYSTEM_CONFIG_USE_LWIP
	static bool NetworkIsReady()
	{
	bool ready = true;

	for (size_t j = 0; j < gNetworkOptions.TapDeviceName.size(); j++)
	{
	for (int i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++)
	{
	if (!ip6_addr_isany(netif_ip6_addr(&(sNetIFs[j]), i)) && ip6_addr_istentative(netif_ip6_addr_state(&(sNetIFs[j]), i)))
	{
	ready = false;
	break;
	}
	}
	}
	return ready;
	}

	static void OnLwIPInitComplete(void * arg)
	{
	printf("Waiting for addresses assignment...\n");
	}

	#endif // CHIP_SYSTEM_CONFIG_USE_LWIP

	void ShutdownNetwork()
	{
	gTCP.ForEachEndPoint([](TCPEndPoint * lEndPoint) -> Loop {
	gTCP.ReleaseEndPoint(lEndPoint);
	return Loop::Continue;
	});
	gTCP.Shutdown();

	gUDP.ForEachEndPoint([](UDPEndPoint * lEndPoint) -> Loop {
	gUDP.ReleaseEndPoint(lEndPoint);
	return Loop::Continue;
	});
	gUDP.Shutdown();
	#if CHIP_SYSTEM_CONFIG_USE_LWIP
	ReleaseLwIP();
	#endif
	}

	void DumpMemory(const uint8_t * mem, uint32_t len, const char * prefix, uint32_t rowWidth)
	{
	int indexWidth = snprintf(nullptr, 0, "%" PRIX32, len);

	if (indexWidth < 4)
	indexWidth = 4;

	for (uint32_t i = 0; i < len; i += rowWidth)
	{
	printf("%s%0*" PRIX32 ": ", prefix, indexWidth, i);

	uint32_t rowEnd = i + rowWidth;

	uint32_t j = i;
	for (; j < rowEnd && j < len; j++)
	printf("%02X ", mem[j]);

	for (; j < rowEnd; j++)
	printf(" ");

	for (j = i; j < rowEnd && j < len; j++)
	if (isprint(static_cast<char>(mem[j])))
	printf("%c", mem[j]);
	else
	printf(".");

	printf("\n");
	}
	}

	void DumpMemory(const uint8_t * mem, uint32_t len, const char * prefix)
	{
	const uint32_t kRowWidth = 16;

	DumpMemory(mem, len, prefix, kRowWidth);
	}